Mekanik alaşımlama ile üretilen Al-Cu-Ni-Ti alaşımının yapısal ve termal karakterizasyonu

Abstract

Bu çalışmada Al60Cu20Ni18Ti2 alaşımı, yüksek enerjili bilyeli öğütme cihazı kullanılarak üretilmiştir. Farklı öğütme süreleri sonrasında elde edilen toz karışımların mikroyapıları ve termal davranışları X-ışını kırınımı (XRD), taramalı elektron mikroskobu-enerji dağılımlı X-ışını spektroskopisi (SEM-EDX) ve diferansiyel termal analiz (DTA) ile karakterize edilmiştir. Öğütme süresinin artmasıyla alaşımın yapısında başlangıç fazlarıyla beraber AlNi ve Al3Cu2 intermetalik fazlarının oluştuğu belirlenmiştir. Bununla birlikte toz karışımın artan öğütme süresiyle parçacık boyutunun küçüldüğü ve daha homojen bir yapıya dönüştüğü görülmüştür. 30 saatlik öğütme sonrası elde edilen nihai alaşımın DTA analizinde kristallenme sıcaklıkları belirlenerek Kissinger metoduyla aktivasyon enerjileri hesaplanmıştır.

Keywords

• Al-bazlı alaşımlar
• mikroyapı
• termal özellikler
• mekanik alaşımlama

Thermal and microstructural characterization of Al-Cu-Ni-Ti alloy produced by mechanical alloying

Abstract

In the present work, a high-energy planetary ball mill was used to produce Al60Cu20Ni18Ti2 alloy from its elemental powders. Structural formations and thermal behaviors of the mechanically alloyed powders at different grinding times have been investigated by a combination of X-ray diffraction (XRD), differential thermal analyzer (DTA) and scanning electron microscopy with energy dispersive X-ray analysis (SEM-EDX). As the grinding time increased, more homogeneous structure and intermetallic phases such as AlNi and Al3Cu2 were observed, and grain size decreased. The crystallite sizes of Al60Cu20Ni18Ti2 alloys were estimated by XRD peak broadening. The XRD results are in good agreement with the SEM-EDX observations. Furthermore, during the heat-treating via DTA for alloy complex produced at 10-30 h milling time, three exothermic phase transition peaks were observed. Also, the dependence of crystallization temperature on the heating rate was performed, and the phase transition activation energies were calculated.

Keywords

• Al-based alloys
• microstructure
• thermal properties
• mechanical alloying.

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